| 1950 |
- The Tokyo Stock Exchange started calculating and publishing the TSE stock prices average by ex-right adjustment methods ,now known as the Nikkei Stock Average. (September)
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| 1970 |
- Upon discontinuation of the TSE Adjusted Stock Price, Nihon Keizai Shimbun Inc. (Nikkei Inc.) succeeded announcement by commissioning calculation to its related body. (July)
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| 1971 |
- Nikkei subsidiary, Nihon Short-wave Broadcasting Co., Ltd, (now known as Nikkei Radio Broadcasting Corporation) started calculating and publishing the Adjusted Stock Price as "NSB 225 Adjusted Average". (July)
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| 1975 |
- Cooperating with U.S. Dow-Jones & Company, Nikkei gained exclusive rights to naming and calculation of the Dow method, and starts publishing the index as "the Nikkei Dow-Jones Stock Price Average". (May)
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| 1982 |
- Nikkei started calculating and publishing the Nikkei Dow-Jones 500 Stock Average, now known as the Nikkei 500 Stock Average. (January)
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| 1985 |
- Nikkei started calculating and publishing the Nikkei Over-the-Counter Stock Average. (April)
- Nikkei changed the name to the Nikkei Stock Average from the Nikkei Dow-Jones Stock Average after agreeing with US Dow-Jones & Company. (May)
- Nikkei started the real-time calculation (every 1 minute) of the Nikkei Stock Average. (October)
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| 1986 |
- SIMEX, Singapore International Monetary Exchange (now known as SGX, Singapore Exchange) started the Nikkei Stock Average Futures trading. (September)
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| 1988 |
- The Osaka Securities Exchange, OSE started the Nikkei Stock Average Futures trading. (September)
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| 1989 |
- The OSE started the Nikkei Stock Average options trading. (June)
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| 1990 |
- CME, Chicago Mercantile Exchange started Nikkei Stock Average Futures options trading. (September)
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| 1993 |
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| 1994 |
- The OSE started the Nikkei 300 Futures and Option trading. (February)
- CBOE, Chicago Board Options Exchange started the Nikkei 300 Option trading. (July)
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| 1995 |
- SIMEX started the Nikkei 300 Futures and Future options trading. (February)
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| 2000 |
- Nikkei conducted the changes in constituents for the first time based on the new selection rule. (April)
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| 2001 |
- The TSE and the OSE started trading the ETF (Exchange Trade Funds) on the Nikkei Stock Average. (July)
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| 2002 |
- Nikkei changed the name to the Nikkei JASDAQ Stock Average from the Nikkei Over-the-Counter Stock Average to after obtaining consents by Japan Security Dealers Association, JSDA and Jasdaq Market Inc.. (October)
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| 2005 |
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| 2006 |
- The OSE started the Nikkei Stock Average Futures mini trading. (July)
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| 2007 |
- Nikkei separated the Electronic Media Bureau to form Nikkei Digital Media Inc. who succeeded the index operation including calculating the Nikkei indices from Nikkei. (January)
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| 2009 |
- Nikkei and TOCOM started to jointly manage the "Nikkei-TOCOM Commodity Index".(April)
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| 2010 |
- Nikkei established a new Index Business Office and started operating the index businesses mainly in place of Nikkei Digital Media Inc. (January)
- Calculation intervals of the Nikkei Stock Average became every 15 seconds from 1 minute. (January)
- Nikkei started calculating and publishing the Nikkei Stock Average Dividend Point Index. (April)
- The SGX started the Nikkei Stock Average Dividend Point Index Futures trading. (June)
- The TSE started the Nikkei Stock Average Dividend Point Index Futures trading. (July)
- Nikkei started calculating and publishing the Nikkei Stock Average Volatility Index. (November)
- TFX, Tokyo Financial Exchange Inc. started Exchange Equity Index Margin Contracts trading, targetted to Nikkei Stock Average. (November)
- Nikkei started calculating and publishing the Nikkei China Related Stock 50. (December)
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| 2011 |
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| 2012 |
- Nikkei started the real-time calculation (every 15 seconds) of the Nikkei Stock Average Volatility Index. (January)
- The OSE started the Nikkei Stock Average Volatility Index Futures (Nikkei 225 VI Futures) trading. (February)
- Nikkei started calculating and publishing the Nikkei 225 Total Return Index. (December)
- Nikkei started calculating and publishing the Nikkei 225 VI Futures Index. (December)
- Nikkei and TOCOM started calculating and publishing the "Nikkei-TOCOM Leveraged Index" and "Nikkei-TOCOM Inverse Index". (December)
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| 2014 |
- Nikkei, JPX Group and Tokyo Stock Exchange started calculating and publishing jointly developed index "JPX-Nikkei Index 400". (January)
- Nikkei started calculating and publishing the Nikkei 225 Double Inverse Index. (June)
- The OSE started the JPX-Nikkei Index 400 Futures (JPX-Nikkei 400 Futures) trading. (November)
- Nikkei started calculating and publishing the Nikkei 225 Currency Hedged Indexes (US Dollar, Euro). (December)
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| 2015 |
- Nikkei, JPX Group and Tokyo Stock Exchange started calculating and publishing jointly developed index, "JPX-Nikkei 400 Currency Hedged Index"(US Dollar, Euro, British Pound). (January)
- The OSE started the Nikkei 225 Weekly Option trading. (May)
- Nikkei, JPX Group and Tokyo Stock Exchange added Swiss Franc hedged index to the jointly developed index, "JPX-Nikkei 400 Currency Hedged Index". (May)
- Nikkei, JPX Group and Tokyo Stock Exchange started calculating and publishing jointly developed index, "JPX-Nikkei 400 Leveraged and Inverse Index"(Leveraged (2x), Inverse (-1x), Double Inverse (-2x)). (August)
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| 2016 |
- Nikkei started calculating and publishing the Nikkei Asia300 Index based on the group of around 300 must-watch companies selected by Nikkei as "Asia300" from China/Hong Kong, South Korea, Taiwan, India, and 6 countries from South East Asia. (December)
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| 2017 |
- Nikkei started calculating and publishing the Nikkei 225 High Dividend Yield Stock 50 Index. (January)
- Nikkei and Tokyo Stock Exchange started calculating and publishing jointly developed index "JPX-Nikkei Mid and Small Cap Index". (March)
- Calculation intervals of the Nikkei Stock Average (Nikkei 225) became every 5 seconds from 15 seconds. (July)
- Nikkei started calculating and publishing the Nikkei Asia300 Investable Index (USD, JPY) designed to be used as the underlying index for the financial products such as investment funds. (December)
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| 2019 |
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| 2020 |
- Nikkei was granted "Recognition" as the first Japanese index provider under the EU Benchmarks Regulation. (May)
- Nikkei introduced Consultation for significant changes to its indexes. (May)
- Nikkei partially revised the constituent selection rules of the Nikkei 225. (June)
- Nikkei started calculating and publishing the Nikkei ESG-REIT Index and the Nikkei High Yield REIT Index. (July)
- Nikkei and JPX Group changed the name to the Nikkei-JPX Commodity Index from the Nikkei-TOCOM Commodity index in line with some of listed commodity futures products were transferred from Tokyo Commodity Exchange to Osaka Exchange. (July)
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| 2021 |
- The SGX started the Nikkei ESG-REIT Index Futures trading. (June)
- Nikkei partially revised the Index Guidebbok and the Constituent Selection Rules of the Nikkei 225(Introduction of the "Price Adjustment Factor" etc.). (July)
- The OSE started the Nikkei 225 Total Return Index Futures trading. (September)
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| 2022 |
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| 2023 |
- The SGX started the Nikkei 225 Climate Change 1.5°C Target Index Futures trading. (March)
- The OSE started the Nikkei 225 Micro Futures trading, the Nikkei 225 Mini Option trading and the Nikkei 225 Climate Change 1.5°C Target Index Futures trading. (May)
- Nikkei started calculating and publishing the Nikkei Consecutive Dividend Growth Stock Index and the Nikkei Progressive and High Dividend Stock Index. (June)
- Nikkei partially revised the Index Guidebbok and the Constituent Selection Rules of the Nikkei 225(Introduction of the "Stepwise Addition" etc.). (July)
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| 2024 |
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